Telephone-exchange system



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s. B. WILLIAMS ET AL TELEFHONE EXCHANGE SYSTEM Original Filed June 25. 1924 18 Sheets-Sheet 18 Patented Sept. 21, 1926.

UNITED srargg l PATENT orFie E, f

SAMUEL B.l w'ILLIniirs,` 0E BEQOKLYNNEW YORK, AND EAEL s. Grinsoi'r., 0E 'RIDGE- Woo'n, NEW JERSEY, AssIGNoEs fro WESTERN ELECTRIC ooiyrinNY, INCOEPQ- EATEDjo'F NEW Yonx, N. YJA ,onEoEn'rIoN 0E NEW Yong.

TELEPHONE-EXCHANGE SYSTEM.

Application led .Tune 25, 192,4, Serial N0. 722,215. Renewed April 5, 1926.

This invention relates to telephone eX- change systems ,in generaland more specifi-l cally to such systems wherein automatic switches are employed for'the establishment and completion of connections.

In telephone `systems where switches, of.

the coordinate type are employed and these switches are selectively operable in accordance with the setting of a common controlling mechanism it is necessary that .the controlling mechanism be associated with the proper switch or group of switches in which a selected trunk terminates. Furthermore, when the trunks of a group leading from a selector switch are divided and terminate a number of succeeding equivalent switches, it becomes necessary to associate the controlling mechanismnot only with the proper one.v

oit the latter switches but also with theparlti'cular division of the group of selected trunks terminating in this switch.

Accordingly it is an object ot this invention to provide animproved meanshfor associating controlling mechanisms with selectively operable switchesft'or controlling such switches..

It is a further object of the invention` to provide an efficient means for testing and connecting to any one of a groupoi1 unnumbered l?. B X. lines. Y

A feature of theinvention relatesto the use of a common testing mechanism whichl is associable with a number of trunks for the purpose ot selecting an idle one thereof andl for locating the particular switch or portion of the switch wherein the idle trunk termiy nates.

A further feat-ure of the inventionl relates to means for selecting a groupl of trunks at a first selective switch and for simultaneously setting up a record, in a controlling sender, of the location of this selected group, to subsequently associate a common control- 1 ling mechanism. with .the second selective switch to which the trunks of this selecte/d group lead. 1 l.

Another feature of the inventionrelates yto the means tor testing and completing conneet-ions to unnumbered lines such as those leading to private branch exchanges.

connector.

is shown one of a number of coordinatesender selector switches for associating call:- ing subscribers lines with a registering and controlling sender such asV shown, :part schematically and part in detail, below the broken line. l

Fig. 2 illustrates one of a number of coordinate district .selector' switches together with groups of trunks outgoingtheretrom. Fig. above the brokenlineshows one oi a number ot' local incoming trunks leading from the districtswitch;n These .trunks Y employed in completing -localfconnections. Below the broken line is disclosed one of a plurality of coordinate oiiice selector switches for extending callinglinesto -dstant oices. v

`Fig'. 4 illustrates a coordinate local incoming or second selector yswitch'and groupsV of trunks outgoing therefrom, together with certain'controlling equipment. 5 illustratesv a final selector or conneet-or switch in which calledsubscribers lines terminate and in which lines leading to a private branch iexchangealso terminate. i Figl 6 illustrates a` sender connector device for associating a selected sender with an idle common controlling mechanism or outgoing marker.

Fig.` 7 to thel lett shows af'district frame connector while tothe right is shown the district trunkuconnector. i

Fig. 8 tothe left shows 'an otlice frame connector connector. v Fig. 9 to the an incoming frame connector. To the right of the broken line is shownl afinal trunk and to the right an oiiice trunklett of the broken line shows luc n Fig. 10 at the upper left portion shows a final frame connector. The remainder of this figure shows a final translator.

Fig. 11 shows the register and translator portions of an outgoing marker.

Fig. 12 shows the controlling equipment of the outgoing marker.

Fig. 13 shows testing equipment located in the outgoing marker.

Fig.4 14 showstesting and controlling equipment of the incoming marker which controls the selective operation of the incoming and final switches.

Fig. 15 shows a final translator connector for connecting any of' the incoming markers to any of the final translators, one of which is shown in Fig. 10

Fig. 16 shows a sender'connector for connecting the register senders to the incoming markers. i

Fig. 17- shows the register equipment located in the incoming marker.

Fig. 18 illustrates in schematic form the arrangement of the circuits and apparatus shown'in detail in Figs. 1 to 17, inclusive.

Referring to Fig. 18 it will be seen that the subscribers lines enter the exchange and have an appearance in the contacts of1 a number of line switches such as 1801. Terminating in other contacts of the line switches and outgoing therefrom are a number of district selector trunks 1802, 183.8. `The trunks outgoingr from the line switchesvterminate in contacts of district selectorswitches, such as 1803, 1804, etc., which are arranged in groups.

It will be observed that certain of the trunks outgoing from the district selector switches, as the group of trunks 1805, lead to ofiice selector switches 1806,'1807, etc. The arrangement is such that the total number of any group of trunks extending between any district switch as 1804 and any office switch as 1806 is divided. Part of the group appears in one oflice switch while the remainder of the group appears in a second oiiice switch. Thus a portion of thel trunk group 1805 leads to switch 1806 while another portion leads to the switch 1807. Other trunks are also provided for the purpose of establishing local connections.v These are representedy by the trunk groups 1808, 1809, 1810, etc. In a manner similar to that described, these local incoming trunks are distributed among a number of incoming switches 1811 and 1812 etc. Thus the trunks of group 1809 are divided between incoming 'switches 1811 and 1812.

The trunks as 1802, 1813, etc., outgoing from the line switches also have an appearance in the sender selector switch 1814 whose function it is to associate an idle one of the senders 1815, 181,6 with a calling line. The selected idle sender is then connected by means of the device 1817 to an idle outgoing marker. Two of these markers 1818, 1819 are shown.

For the purpose of associating the outgoing markers with the district switches there are provided a number of district frame connectors as 1820. The outgoing markers are also associable with the trunks leading from the district switch by means of trunk connectors as 1821. When a particular district frame and a group of trunks outgoing therefrom have been associated with an outgoing marker, a test is made therein to determine an idle trunk and an idle link in the district switch. At the same time a test is being made to determine the particular switch to which this idletrunk leads and to the particular part of the Vgroup to whichv this trunk belongs.

Let it be assumed, ,for example, thatv a` calling subscriber has obtained connection through line switch 1801 and one of the trunks 1802 to the district switch 1803. Let it be further assumed that the translation of the called line record in the marker has caused the selection' of a trunk in a group 1810, trunk 1829, for example. While the outgoing` marker was making the test of the trunks in group 1810, a record was being transmitted'to the incoming switch registers of the sender. This record of the incoming frame in which trunk 1829 terminates is determined conjointly by the operation of a district trunk connector as 1821 and the particular-manner in which the testing equipment located in the marker is operated.

When the connection has thus been completed through switch 1808 to the 'trunk 1829 and a recordset up in thev sender iden tifying the local incoming switch 1811., the outgoing marker` and sender connector as well as the trunk and frame connectors are released and revert to common use.

The sender connector 1824 is next actuated to connect the register sender with an idle incoming marker such as 1825 Ywhereupon the numerical portion of the called line designation is transferred from the sender registers to the' registers of the incoming marker. At this time the record of the incoming switch in which trunk 1829 terminates is also transferred 'from the incoming Aframe registers of the sender-to the incoming frame registers 'of the marker.V The incoming marker now proceeds under controlv of this transferred record to operate the proper incoming frame connector as 1826 which will give the marker access to the frame 1811. associated with the proper frame, and having identified the proper group of trunks extending between incoming and final frames, causes the operation of the final trunk connector- 1827. A test is now made in the incoming marker to determine an idle linkin switch 1811, an idle trunk lin The marker having thus been 1 

